| Organization | Department & Ministry | Institution Type | State |
|---|---|---|---|
| S I E L Ltd. | — | — | Delhi |
| Siemens Healthcare Pvt. Ltd. | — | — | Karnataka |
| Siemens Ltd. | — | — | Maharashtra |
| Sigma University | — | Centres of Higher Learning | Gujarat |
| Signify Innovations India Ltd. | — | — | West Bengal |
| S I Group-India Ltd. | — | — | Maharashtra |
| Sika India Pvt. Ltd. | — | — | West Bengal |
| Sikkim Alpine University | — | Centres of Higher Learning | Sikkim |
| Sikkim Global Technical University | — | Centres of Higher Learning | Sikkim |
| Sikkim International University | — | Centres of Higher Learning | Sikkim |
| Sikkim Manipal University | — | Centres of Higher Learning | Sikkim |
| Sikkim Professional University | — | Centres of Higher Learning | Sikkim |
| Sikkim Skill University | — | Centres of Higher Learning | Sikkim |
| Sikkim University | — | Centres of Higher Learning | Sikkim |
| Sikko Industries Ltd. | — | — | Gujarat |
| Siksha 'O' Anusandhan | — | — | Odisha |
| Silicon University | — | Centres of Higher Learning | Odisha |
| Silktex Ltd. | — | — | Karnataka |
| Silkworm Seed Technology Laboratory (SSTL) | Ministry of Textiles | — | Karnataka |
| Siltex International Ltd. | — | — | Karnataka |
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